References for the Particle Field Interaction, Non-Relativistic Interface
1. C. D. Child, “Discharge from hot CaO.” Physical Review (Series I), vol. 32, no. 5, pp. 492–511, 1911.
2. S. Humphries, “Numerical modeling of space-charge-limited charged-particle emission on a conformal triangular mesh.” Journal of Computational Physics, vol. 25, no. 2, pp. 488–497, 1996.